For the buttercream ... Pipe ‘Happy Birthday’ onto the cake (or a message of your choice) and use the remaining royal icing to stick the piped flowers onto the top and sides of the cake.

A homemade birthday cake ... from the oven and take the cakes out of the tins after about 10 minutes. Place the cakes on a wire rack to cool completely. To make the buttercream icing, sift half ...